Calprotectin is a protein found inside the cytoplasm of the immune cells within the intestine known as neutrophils, granulocytes and macrophages. Under conditions of mucosal inflammation as seen in inflammatory bowel disease, calprotectin is released into the lumen of the bowel and excreted in the stool. Fecal Calprotectin levels can be measured and serve as a biological marker of the degree of mucosal inflammation in the bowel. Fecal calprotectin levels have not been previously correlated with the degree of mucosal inflammation seen on CT Enterography.